Lochinvar 400-801 Flue Sensor Fault, Flue Temp Diff, Flue Temp Limit, Fatal Error, Memory Error

Page 43

Service Manual

3 Troubleshooting (continued)

Table 3-4(continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT

DESCRIPTION

 

 

CORRECTIVE ACTION

 

 

 

 

 

 

• Check

wiring to sensor. Make sure wiring is

Flue Sensor Fault

 

 

connected and not damaged.

Reconnect / repair

 

 

wiring if necessary.

 

(will require a manual reset

 

 

 

The control reads the flue sensor as open

 

 

 

 

once the condition has been

• Measure the resistance of the sensor and compare

corrected. Press the RESET

or shorted.

 

to the resistance in Table 3-2D on page 35 of this

button on the SMART

 

 

 

 

manual. Replace the sensor if necessary.

SYSTEM display to reset.)

 

 

 

 

 

 

 

 

 

•

Replace control module.

 

 

 

 

 

 

 

• Check

wiring to sensor. Make sure wiring is

 

 

 

connected and not damaged. Reconnect / repair

Flue Temp Diff

 

 

wiring if necessary.

 

 

• Measure the resistance of the sensor and compare to

(will require a manual reset

The control module reads an excessive

once the condition has been

 

the resistance in Table 3-2D on page 35 of this

corrected. Press the RESET

temperature difference between the two

 

manual. Replace sensor if necessary.

button on the SMART

sensors.

 

 

 

 

 

•

Restore control parameter defaults from optional PC

SYSTEM display to reset.)

 

 

 

 

software.

 

 

 

•

Replace control module.

 

 

 

 

 

 

• Inspect the heat exchanger. Reference page 32 of

 

 

 

this manual for the procedure on how to clean the flue

 

 

 

side of the heat exchanger.

 

Flue Temp Limit

 

• Inspect

the flue sensor and

associated wiring.

(will require a manual reset

 

The stack temperature has exceeded the

 

Measure the resistance of the flue sensor and

once the condition has been

 

 

compare to Table 3-2D on page 35 of this manual.

corrected. Press the RESET Flue Temp Limit set parameters.

 

 

Replace the sensor if necessary.

 

button on the SMART

 

 

 

 

 

 

 

 

SYSTEM display to reset.)

 

• Verify that the vent/air intake

pipes are properly

 

 

 

 

 

installed and that there are no obstructions.

 

 

• Replace the main control board.

 

 

 

• Restore the parameter defaults from the optional PC

Fatal Error

The control module has detected parameter

software.

settings that are out of range.

 

 

• Replace control module.

 

 

Memory Error

A lockout occurs at the same time as a power outage.

• Reset control module.

43

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Contents Models 400 Contents Handling ceramic fiber materials Please read before proceedingNiosh stated First Aid When servicing boiler Troubleshooting What is in this manual?Service MaintenanceNear boiler piping ServiceNavigation Dial Knight XL displayLOW Voltage Connection Board Control inputsControl outputs Smart Control ModuleHow the control module operates Access modesGeneral Operation How the boiler operatesOperation Display From previous page Sequence of Operation Button Screen Operation Display Status Display panel menu accessButton Screen Status Operation Display Display panel parameter accessParameter table Description See User Access Installer Access Display ModifyMenu Resetoutdoor ANTI-CYCLING Description See User Access Installer Access Display ModifySoftware Version Temperature units C / FViewable and changeable control parameters Time and DateData Logging Temperature SettingsFunctions DHW Settings Outdoor Reset Anti-Cycling Control modes Minimum On/Off Time Cascade OffsetCirculation pumps DHW Pump Anti-Seize Delay Boiler Pump DelayDHW Pump Delay Boiler Pump Anti-Seize DelayService Notification Service technician Maintenance Maintenance and annual startupOwner maintenance Maintenance Check water system Flue vent system and air pipingCheck expansion tank Check boiler relief valve Inspect ignition and flame sense electrodes Check ignition ground wiringCheck all boiler wiring Check control settingsModel Kit Part Component Number Description Check flame signalCleaning boiler heat exchanger Review with ownerTest low water flow conditions Test procedureCheck control module fuses TroubleshootingBefore troubleshooting Check the followingUnit Does No DisplayNo Burner OperationResistance Temperature Checking temperature sensorsTemperature Resistance Temperature Resistance Wire Color R/BK and Y Wire Color G and YSystem Pump NoisyNo Pump Boiler PumpTroubleshooting Flame Fail Ign Temp SwOpen Anti-cyclingFlame Sequence Cont’dOutlet Mrhl Outlet ArhlGV/Relay Fan Low/HighFan Speed Low HighInlet Sensor FaultSensor Shorted Louver ProvingFlue Temp Diff Flue Sensor FaultFatal Error Memory ErrorDelta T High Flue Temp HighOutlet Temp Rem Ctrl Flt Service BlkWatch Dog Error No Error StoredCombustion Analysis Procedure Model Gas valve adjustment procedureModels 601
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400-801 specifications

The Lochinvar 400-801 is a high-efficiency commercial boiler that embodies advanced engineering and cutting-edge technology. Designed for a variety of commercial applications, this boiler is known for its reliability, efficiency, and robust performance.

One of the standout features of the Lochinvar 400-801 is its high thermal efficiency, which can reach up to 99%. This efficiency not only reduces fuel consumption but also lowers operating costs, making it an economical choice for businesses seeking to minimize overhead. The boiler employs a stainless steel fire-tube heat exchanger that ensures optimal heat transfer and durability. This construction allows for enhanced resistance to corrosion, thereby extending the boiler's lifespan.

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Installation and maintenance of the Lochinvar 400-801 are straightforward, thanks to its compact design and multiple venting options. The low-profile construction allows for flexibility in placement, making it an ideal fit for tight spaces. Maintenance tasks are simplified with accessible components, minimizing downtime and ensuring the system operates efficiently over its lifespan.

In conclusion, the Lochinvar 400-801 stands out in the commercial boiler market with its blend of efficiency, reliability, and innovation. With its advanced technologies and features, businesses can achieve significant energy savings while ensuring comfortable and consistent heat for various applications. The Lochinvar 400-801 is an investment in quality and performance, backed by a well-established brand in the heating industry. Whether for a new installation or a replacement, this boiler offers a comprehensive solution for commercial heating needs.
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